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Help on factory a/c system on 67 chevelle

67SS396 on Mon July 20, 2009 5:50 PM User is offline

Year: 1967
Make: Chevy
Model: Chevelle SS
Engine Size: 396
Refrigerant Type: Freeze 12

I did a frame off on my car and have replaced everything on the A?C system including the POA valve. I bought the last one that my A/c guy had in 2005. I have been reading all the posts here to get info on my problem. Here it is I cannot get the air out of the vents to blow no colder than 60 degrees and most at idle around 70. I have freeze 12 in the system and have charged it with 3.75 lbs of freon. My guages were reading 32-35 on low side and around 225-250 high side at 1500 RPMS . It is 95-98 degrees here in Texas.

I have been reading about the adjustment on the POA valve so I checked mine and it is reading 30. I was gonna try and adjust it to 26 but I did not see an adjustment screw. Is the 7/32 screw in the outlet side of the valve towards the compressor? Any help will be greatly appreciated.


bohica2xo on Tue July 21, 2009 2:44 AM User is offline

Last time I looked, R12 is still available in TX. Charge the system with R12 and you should be good to go.


"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

NickD on Tue July 21, 2009 6:01 AM User is offline

Freeze12 is not R-12, it's 85% R-134a and you have to use an R-134a compatible dryer and oil. You are not the first to post this. If you used NOS components, may also have a mess on your hands, kind of like filling your gas tank with diesel fuel.

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